Process and apparatus for identifying articles of sheet material by means of microwaves
First Claim
1. An apparatus for the identification of a sheet or plate article, the article being composed of an electrically non-conductive material and being marked for identification by the incorporation of electrically conductive materials, comprising:
- a frame;
at least one first and at least one second microwave device, for producing waves, said first and second device being mounted on said frame one adjacent the other;
at least one first and one second detector of waves transmitted by the article when the article is advanced before said devices, said detectors being placed in front of the respective microwave devices so, when the article is advanced, the article traverses each said detector and respective device in a traversing direction;
a support for the article, said support positioned between said devices and said detectors;
a circulator means or directional coupler means, associated with each said microwave device, for deviating waves reflected by the article towards a detector of said reflected waves; and
, adjusting means for adjusting the respective distance between said microwave devices and said detectors of transmitted waves and said microwave devices and said support.
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Accused Products
Abstract
An apparatus for the identification by microwaves of a sheet article composed of an electrically non conductive material, the article being marked for identification by the incorporation therein of electrically conductive fibers. The apparatus comprises at least two microwave emitter devices one adjacent the other with detectors for the waves reflected by the article when advanced before said devices. The apparatus comprises also detectors for the waves transmitted through the article and placed in front of said emitter devices. Regulating methods of the apparatus are also described for raising the sensitivity of the identification signals through setting of the distances between the emitter devices, detectors for transmitted waves and support for the interposed article.
19 Citations
15 Claims
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1. An apparatus for the identification of a sheet or plate article, the article being composed of an electrically non-conductive material and being marked for identification by the incorporation of electrically conductive materials, comprising:
- a frame;
at least one first and at least one second microwave device, for producing waves, said first and second device being mounted on said frame one adjacent the other;
at least one first and one second detector of waves transmitted by the article when the article is advanced before said devices, said detectors being placed in front of the respective microwave devices so, when the article is advanced, the article traverses each said detector and respective device in a traversing direction;
a support for the article, said support positioned between said devices and said detectors;
a circulator means or directional coupler means, associated with each said microwave device, for deviating waves reflected by the article towards a detector of said reflected waves; and
, adjusting means for adjusting the respective distance between said microwave devices and said detectors of transmitted waves and said microwave devices and said support. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- a frame;
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12. A method for regulating an apparatus for the identification of a sheet or plate article, the article composed of an electrically non-conductive material, the article being marked for the identification by the incorporation of electrically conductive materials, the apparatus including at least one first and at least one second microwave device for producing waves, at least one first and one second detector of transmitted waves, at least one first and one second detector of reflected waves and a support for the article, comprising the steps of:
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(a) regulating the distance A between each of the microwave devices and the respective detectors of transmitted waves in the absence of the article so as to obtain in said detectors of transmitted waves a predetermined transmission signal level; (b) readjusting said distance A in the absence of the article so as to obtain in said detectors of reflected waves a predetermined reflection signal level; (c) fixing said distance A after said readjusting said distance A; (d) placing the article in said support between said detectors of transmitted waves and microwave devices; (e) regulating the distance B between said microwave devices and said support carrying the article so as to obtain in said detectors of reflected waves a reflection signal level substantially different from said predetermined reflection signal level; and
,(f) fixing said distance B after said regulating the distance B. - View Dependent Claims (13, 14, 15)
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Specification